Khullar Sadhika, Singh Sandhya, Das Prasenjit, Mandal Sanjay K
Department of Chemistry, DAV University, Jalandhar-Pathankot NH44, Jalandhar, Punjab 144012, India.
Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, Manauli PO, S.A.S. Nagar, Mohali, Punjab 140306, India.
ACS Omega. 2019 Mar 13;4(3):5283-5292. doi: 10.1021/acsomega.9b00223. eCollection 2019 Mar 31.
A new mixed pyridyl-carboxylate ligand with two picolinate chromophores and a flexible linear spacer, potassium 2,2'-(butane-1,4-diylbis((pyridin-2-ylmethyl)azanediyl))diacetate (Kbpbd), which is obtained in high yield and spectroscopically characterized, has been utilized to make new lanthanide complexes, namely, [Ln(bpbd) (HO)(NO)]·HO, where Ln = Tb () and = 6, Ln = Sm () and = 7, and Ln = Dy () and = 7. These complexes have been extensively characterized by various spectroscopic techniques (UV-vis and Fourier transform infrared spectroscopy), elemental analyses, thermogravimetric analysis, field emission scanning electron microscopy, and powder X-ray diffraction. These show very intense characteristic luminescence features that confirm the antenna effect of the ligand on the metal center. These complexes have been utilized for the detection of various nitroaromatic compounds. Among these three complexes, is found to be the best for the selective sensing of 2,4,6-trinitrophenol in water with a detection limit of (0.35 ± 0.05) ppm. Its Stern-Volmer constant, [(5.48 ± 0.1) × 10 M], is one of the highest among similar sensors reported so far.
一种新型的混合吡啶羧酸配体，含有两个吡啶甲酸发色团和一个柔性线性间隔基，即2,2'-（丁烷-1,4-二基双（（吡啶-2-基甲基）氮杂二基））二乙酸钾（Kbpbd），其产率高且经过光谱表征，已被用于制备新的镧系元素配合物，即[Ln(bpbd)(H₂O)(NO₃)]·H₂O，其中Ln = Tb（Ⅲ）且ν = 6，Ln = Sm（Ⅲ）且ν = 7，以及Ln = Dy（Ⅲ）且ν = 7。这些配合物已通过各种光谱技术（紫外可见光谱和傅里叶变换红外光谱）、元素分析、热重分析、场发射扫描电子显微镜和粉末X射线衍射进行了广泛表征。这些配合物显示出非常强烈的特征发光特性，证实了配体对金属中心的天线效应。这些配合物已被用于检测各种硝基芳香族化合物。在这三种配合物中，发现[Dy(bpbd)(H₂O)(NO₃)]·H₂O对于水中2,4,6-三硝基苯酚的选择性传感效果最佳，检测限为(0.35 ± 0.05) ppm。其斯特恩-沃尔默常数KSV[（5.48 ± 0.1）× 10⁴ M⁻¹]是迄今为止报道的类似传感器中最高的之一。
